[GRASS-dev] [GRASS GIS] #2298: r.stream.order hack= generates order 1 single pixels

[GRASS GIS]

#2298: r.stream.order hack= generates order 1 single pixels
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 Reporter:  hcho            |       Owner:  grass-dev@…              
     Type:  defect          |      Status:  new                      
 Priority:  major           |   Milestone:  7.1.0                    
Component:  Raster          |     Version:  svn-trunk                
 Keywords:  r.stream.order  |    Platform:  Linux                    
      Cpu:  x86-64          |  
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Comment(by hellik):

 Replying to [ticket:2298 hcho]:
 > Running r.stream.order hack= assigns to single pixel tributaries order 1
 instead of 2. I believe that any tributaries should get assigned order >=
 2 and the main stream gets 1.
 >
 > I'm attaching screenshots of a streams and output hack raster maps. In
 the streams map, the blue and green streams merge and flow into the gray
 one. The gray stream has a small one pixel tributary coming in (center
 lowest pixel) and this pixel becomes an order 1 (yellow) in the hack
 output. I think this pixel should become 2 (green) because it's a
 tributary to the gray main stream. I have a lot these single pixel
 dangling tributaries and simply selecting order 1 doesn't make a nice
 looking single polyline representing the main stream.
 >
 > Or maybe, I'm misunderstanding something in the Hack's order algorithm?

 please provide the command producing this result.

 are you using the optional?

  accumulation=name
     Name of input accumulation raster map

 if not, can you rerun r.stream.order with using accumulation raster map?

 thanks.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2298#comment:1>
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